Wrench.



No. 634,2!6. Patented Oct. 3, I899;

w. H. ROBINSON.

(Application Feb. 15, 1898.)

(No Model.)

rrnn STATES WILLIAM H. ROBINSON, OF MARION, IOWA, ASSIGNOR OF ONE-HALFTO J.- A. KRAMER, OF SAME PLACE.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 634,216, dated October3, 1899. Application filed February 16, 1898. Serial No. 670,450. iNomodel.)

To all whom it may concern:

Be it known that I, WILLIAM H. ROBINSON, a citizen of the United States,residing at Marion, in the county of Linn and State of Iowa, haveinvented certain new and useful Improvements in Wrenches; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

The object of this invention is to produce a monkey-wrench for pipes ornuts capable of very quick and close adjustment to varying kinds ofwork, the construction being simple, strong, and comparativelyinexpensive.

The invention will be fully hereinafter described and claimed, referencebeing had to the accompanying drawings, forming a part of thisspecification, in which Figure 1 is a view in perspective of a wrenchembodying my invention. Fig. 2 isa central longitudinal section of thesame, but with smooth instead of serrated jaws. Fig. 3 is a side view ofthe dogs which hold the sliding jaw and of the stirrup for disengagingthem. Fig. 4: is a transverse section in the line w :0 of Fig. 2 and asseen from the left of said line.

Similar letters of reference indicate corresponding parts.

The body of the wrench does not differ materially from others in commonuse, consisting of a head A, serrated shank A, and handle A On the shankis mounted the sliding jaw, which embodies the principal feature of thisinvention.

Bis a rectangular slide fitting the correspondingly-shaped shank A andadapted to slide freely thereon. This terminates at one end in a jaw 13.Theinner face of this jaw is preferably at an angle to the adjacent faceof the other jaw, and to it is fitted, as by a sliding T-shapedconnection, a correspondingly-angled plate B The face of this plate, aswell as the outer jaw, may be serrated, as in Fig. 1, and for use as apipe-wrench this construction 'is necessary; but the sliding plateserves a useful purpose as an adjunct to a nut-wrench, as willhereinafter appear, and both it and the outer jaw may in such case beplane, as shown in Fig. 2. At its lower end--it should be notched tostraddle the shank as it moves down, the lower ends of the platenormally extending as low or a little lower than the upper face of theshank, so as to give a bearing at all times to anything the wrench maygrasp and for the full length of the jaws, if necessary. The plate isforced outwardly to normal position by a suitable spring 0, which may bea part of the spring 0 governing the jaw-holding dogs hereinafter to bedescribed. This terminal spring 0 passes through a slot B in the slidingjaw and at its inner end engages a stud B, which prevents the plate Bfrom moving out farther than the normal position shown in Figs. 1 and 2.

In a suitable recess formed in the upper part of the slide B is placed apair of dogs D and D, the teeth of which are adapted to engage thecorresponding teeth formed on the adjacent side of the shank A. Byreference to Fig. 3 it will be'seen that the teeth of these dogs are setdodging with respect to each other, so as to engage the shank-teethalternately, and by this means it is possible to obtain a fairly-closeadjustment of the sliding jaw and at the same time have teeth on theshank and dogs coarse enough to give the requisite strength. The dogsare held in engagement with the shank by springs C and G whichpreferably are united at the base 0, where the spring as a whole isattached to the jaw B by a screw E.

It will be seen that the construction is such that no pivot-pinisrequired for the dogs, the pivotal part D being retained between thespring 0 and a shoulder B formed in the slide B. This shoulder coincideswith a corresponding shoulder D near this end of the dog, and the endthrust is thus taken by the end of the dog and not by a pivot-pin, witha great increase of strength as a result of such construction.

The dogs are disengaged from the shank by a lifter F, which is in thenature of a stirrup with inwardly turned extremities F. This stirruppasses through suitable holes in the slide, each side of the shank, fromthe back side of the wrench, the loop being always in a position to beconveniently reached by the thumb of the operator and serving also forthe movement of the sliding jaw back and forth on the shank foradjustment. A shoulder 13 at this end of the slide coacting with ashoulder D near the end of the dogs prevents them from slipping out oftheir seat endwise.

In the operation of the wrench itis but necessary to slide the movablejaw up against the nut or pipe to beheld and permit the dogs to engagethe shank. Then on turning the handle in the direction indicated by thearrow the inclined plate B is forced toward the shank, tightening thejaws effectually on the object held by them.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a wrench, the combination with ajaw having a shank and handlerigidly attached thereto, the shank being serrated on one side, of asliding jaw mounted on said shank, a pair of dogs mounted in a recess insaid sliding jaw, adjacent to the serrated side of the shank, with endsabutting on shoulders formed in said jaw-slide, springs adapted to holdsaid dogs in engagement alternately with said shank, and a lifterextending through the slide portion of the jaw from the opposite sideand engaging the free ends of the dogs, the teeth of said dogs beingalternate, substantially as and for the purpose set forth.

2. In a wrench, the combination with the fixed jaw and its serratedshank, of a sliding jaw movable on said shank, and having an angledplate fitted to slide on the angled face of the jaw to tighten thewrench on the work, serrated dogs mounted in a suitable recess in theslide portion of the jaw, a suitable lifter therefor adapted to bepressed by the thumb of the operator to disengage the' dogs, and springsto hold the dogs normally in engagement with the shank, and to force theinclined plate outwardly to normal position, substantially as described.

3. In a wrench, the combination with the fixed jaw and its serratedshank, of a sliding jaw movable on said shank, and having an inclinedface adjacent to the fixed jaw, an inclined plate having aninterlocking, sliding connection with said inclined jaw, a springadapted to force it outwardly to normal position, a stop to limit itsoutward movement, a pair of alternately-engaging dogs coacting with theserrated shank, springs tohold them in engagement, and a lifter adaptedto disengage them, substantially as described.

4. In a wrench, the combination with the fixed jaw and its serratedshank, of a sliding jaw movable thereon, and having an inclined faceopposite the fixed jaw extending some distance below the face of theshank fronting said jaws, an inclined plate having an interlocking,sliding connection with said inclined jaw, and notched at its endadjacent to the shank, so as to straddle the same when forceddownwardly, a spring to force it normally outwardly, a stop to limit itsoutward movement, and means substantially as described for retaining thesliding jaw in any desired position.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM H. ROBINSON. Vitnesses:

J. A. KRAMER, J. F. GRoAT.

